Quantum Computing in a Macroscopic Dark Period

Abstract

Decoherence-free subspaces allow for the preparation of coherent and entangled qubits for quantum computing. Decoherence can be dramatically reduced, yet dissipation is an integral part of the scheme in generating stable qubits and manipulating them via one and two bit gate operations. How this works can be understood by comparing the system with a three-level atom exhibiting a macroscopic dark period. In addition, a dynamical explanation is given for a scheme based on atoms inside an optical cavity in the strong coupling regime and we show how spontaneous emission by the atoms can be highly suppressed.

10 pages, 7 figures, revised version, now including a proposal for the implementation of the scheme with calcium ions, submitted to Phys. Rev. A

References in corpus (2)

• An analysis of a two-atom double-slit experiment based on environment-induced measurements
• Evolution of an Atom Impeded by Measurement: The Quantum Zeno Effect

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• Decoherence-free dynamical and geometrical entangling phase gates
• QED of lossy cavities: operator and quantum-state input-output relations
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• Quantum-state extraction from high-Q cavities
• Towards quantum computing with single atoms and optical cavities on atom chips
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• Decoherence Rates in Large Scale Quantum Computers and Macroscopic Systems
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